Want to know how the Millennium Falcon compares in size to an Imperial Star Destroyer? Just watch a Star Wars movie. But if you want to know how that hunk of junk compares to the Battlestar Galactica, ...

Why do we have seasons? It's because our planet is tilted on its axis just enough so that we have four seasons, as Earth continues its orbit around the Sun. What about other planets?

There’s something about comparing the sizes of unthinkably large objects that’s endlessly intriguing. Looking at a comparison of all the various sizes of stars in the universe, for example, makes for ...